SQL Server
Calculate HRMC IRMark

See more XML Digital Signatures Examples
Demonstrates how to calculate an IRmark for an HMRC GovTalkMessage XML document.
Chilkat SQL Server Downloads

SQL Server
-- Important: See this note about string length limitations for strings returned by sp_OAMethod calls.
--
CREATE PROCEDURE ChilkatSample
AS
BEGIN
    DECLARE @hr int
    -- Important: Do not use nvarchar(max).  See the warning about using nvarchar(max).
    DECLARE @sTmp0 nvarchar(4000)
    -- This example requires the Chilkat API to have been previously unlocked.
    -- See Global Unlock Sample for sample code.

    -- First build a sample (but incomplete) GovTalkMessage.
    -- You can replace this code with a call to LoadXml or LoadXmlFile..
    -- 
    -- Note: The online tool at https://tools.chilkat.io/xmlCreate.cshtml
    -- can be used to generate XML code that creates a given XML document.
    DECLARE @xml int
    EXEC @hr = sp_OACreate 'Chilkat.Xml', @xml OUT
    IF @hr <> 0
    BEGIN
        PRINT 'Failed to create ActiveX component'
        RETURN
    END

    EXEC sp_OASetProperty @xml, 'Tag', 'GovTalkMessage'
    DECLARE @success int
    EXEC sp_OAMethod @xml, 'AddAttribute', @success OUT, 'xmlns', 'http://www.govtalk.gov.uk/CM/envelope'
    EXEC sp_OAMethod @xml, 'UpdateAttrAt', @success OUT, 'Body|Message', 1, 'xmlns', 'urn:g3.ge:dea:call:SendDocument:v1'
    EXEC sp_OAMethod @xml, 'UpdateChildContent', NULL, 'Body|Message', '................'

    -- This is the XML created:
    -- <?xml version="1.0" encoding="utf-8" ?>
    -- <GovTalkMessage xmlns="http://www.govtalk.gov.uk/CM/envelope">
    --     <Body>
    --         <Message xmlns="urn:g3.ge:dea:call:SendDocument:v1">................</Message>
    --     </Body>
    -- </GovTalkMessage>

    EXEC sp_OAMethod @xml, 'GetXml', @sTmp0 OUT
    PRINT @sTmp0

    -- Canonicalize the XML (using C14N)
    DECLARE @xdsig int
    EXEC @hr = sp_OACreate 'Chilkat.XmlDSig', @xdsig OUT

    DECLARE @withComments int
    SELECT @withComments = 0
    DECLARE @canonXml nvarchar(4000)
    EXEC sp_OAMethod @xml, 'GetXml', @sTmp0 OUT
    EXEC sp_OAMethod @xdsig, 'CanonicalizeXml', @canonXml OUT, @sTmp0, 'C14N', @withComments

    -- Return the base64 SHA-1 HASH of the canonical XML.
    DECLARE @crypt int
    EXEC @hr = sp_OACreate 'Chilkat.Crypt2', @crypt OUT

    EXEC sp_OASetProperty @crypt, 'HashAlgorithm', 'sha1'
    EXEC sp_OASetProperty @crypt, 'EncodingMode', 'base64'
    DECLARE @irmark nvarchar(4000)
    EXEC sp_OAMethod @crypt, 'HashStringENC', @irmark OUT, @canonXml


    PRINT 'IRMark = ' + @irmark

    EXEC @hr = sp_OADestroy @xml
    EXEC @hr = sp_OADestroy @xdsig
    EXEC @hr = sp_OADestroy @crypt


END
GO